Final answer:
A typical night's sleep includes four to six dream cycles. These cycles are part of the circadian rhythm, involving REM and delta wave (deep NREM) sleep stages.
Step-by-step explanation:
During a typical night's sleep, it is common to experience four to six dream cycles, though this can vary among individuals.
These cycles occur within the broader context of the body's natural circadian rhythms, and more specifically, the sleep cycle comprises various stages, including REM (Rapid Eye Movement) and NREM (Non-Rapid Eye Movement) sleep.
The REM stage is where most dreaming occurs. Progressing through these cycles, sleep becomes progressively deeper in the NREM stages, reaching the slow-wave or delta wave sleep before cycling back towards REM sleep, where the brain becomes more active again and dreams are most vivid.